The western U.S. is experiencing one of many coldest end-of-winter intervals within the historic document, with too many chilly data to listing.
As an example, let me “heat up” by contemplating the departure from regular of the common most temperatures throughout the area (beneath).
Unbelievable– in some components of the area highs have been down by OVER 15F from regular.
Take into account the common excessive temperature at Los Angeles for a similar interval.
You’ll not imagine it (beneath). The final two weeks had been the coldest for the complete document, going again to the mid-Nineteen Thirties. LA residents are in all probability staying of their sizzling tubs.
For San Francisco, the previous two weeks have had the good most temperatures for the reason that newest Nineteen Sixties.
Portland? The newest two weeks tied for the second coldest for the complete document.
Throughout the previous few weeks, numerous main low-temperature data had been damaged within the West. Not solely had been an enormous variety of each day data damaged, however MONTHLY low-temperature data as properly. That could be very, very uncommon.
Beneath are the places of month-to-month temperature data famous throughout the previous a number of weeks. What has occurred in California is extraordinary.
So why such a profoundly chilly interval?
It is because of excessive amplitude, and weird large-scale circulation within the environment.
Beneath is a map displaying the distinction from regular of the heights (like strain) round 18,000 ft.
You’ll notice a HUGE high-pressure anomaly over the northeast Pacific (purple/orange) and a powerful trough of decrease heights/strain over the west coast (blue colours). This sample is a really chilly one for the West Coast, with northerly circulate over the northeast Pacific.
What’s the predicted floor temperature anomaly for the subsequent 7 days? You guessed it, colder than regular (see European Heart ensemble system prediction beneath).
If this was a record-breaking heat anomaly of the identical magnitude, the media can be going loopy speaking about local weather change and world warming. The Seattle Instances cartoonist David Horsey would have gone to city.
What’s going to you hear from them concerning the chilly wave and local weather? (see beneath)